 And it certainly is something we need to understand. It even ties in with, I'm not going to get into that, as to why we as Christians still need to ask forgiveness of our sin. Sanctifying simply means to be set apart. Biblically, it means to be set apart for God. To be set apart from wickedness unto holiness. This idea is throughout Scripture. I wrote down several of them in Exodus 13. You had the firstborn was to be sanctified, was to be set apart, belong to God.